if is not cooling at all (completely warm/ room temperature) then it could be the start switch on the side of the compressor.

if is a little cool but not cool enough, Check to see if there is any frost buildup in
the back wall of the freezer. If so, it is not defrosting as it should.

possible causes:

bad defrost timer

bad defrost heater (in freezer)

bad thermo switch in freezer

If you don’t know what these are then unplug the machine and let the ice
melt in the freezer overnight with the door open. Then try it the next day, if
is cooling fine then you need to have a service person replace one of the above
items.

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Many times a freezer and/or refrigeratordo not work right because of a dirty condenser coil...there are also many otherthings that can go wrong.
If you are hearing a clicking or buzzing thencheck out the last two tips.

If your refrigerator is running but warm, then...

Check out these tips that I wrote about that... it is a great place to starttrouble shooting your unit...and something that you can do rather then callinga repair person to do a simple thing for you...

Setting the cooling setting up all the way will not help at all.Make sure your freezer and refrigerator controls are about the same setting. Temp. settings for refrigerator should be between 38-42.degree at medium.. Freezer about 0 to -10.If it is a simple fix this will help.